Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
nam duoc » nam thuoc, da duoc, dat duoc
cua tre » cua te, cuu tre, cua triet
va danh » va dinh, va hanh, dia danh
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va dan » ca dan, va dao, va dau
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky lang xa hoi. ((hieu van) OR (hieu va)) nam duoc ((va danh) or (va dan)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky lang xa hoi. ((hieu van) OR (hieu va)) nam duoc ((va danh) OR (va dan)) dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky lang xa hoi. ((hieu van) OR (hieu va)) nam duoc ((va danh) or (va dan)) dai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sac ky lang xa hoi. ((hieu van) OR (hieu va)) nam duoc ((va danh) or (va dan)) dai cua tre*.